<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>

  <div id="app">
    <button-counter></button-counter>
    <button-counter></button-counter>
    <hr>
    <blog-post v-for="post in posts" :key="post.id" :title="post.title"></blog-post> <!-- 组件实例对象 ==>组件对象 -->
  </div>
  
  <script src="../js/vue.js"></script>
  <script>
    // 注册全局组件
    Vue.component('button-counter', {
      data () {
        return {
          count: 0
        }
      },

      // data() ===data()
      // data: {
      //     count: 0
      // },
      template: `<button @click="count += 1">点击了{{count}}</button>`
    })

    // 文章组件
    Vue.component('blog-post', {
      // 声明接收属性
      props: ['title'], // 声明接收的所有数据都会成为组件对象的属性
      template: `<h3>{{title}}<button-counter></button-counter></h3>`
    })

    new Vue({
      el: '#app',
      data: {
        posts: [
          { id: 1, title: 'My journey with Vue' },
          { id: 2, title: 'Blogging with Vue' },
          { id: 3, title: 'Why Vue is so fun' }
        ]
      }
    })
  
  </script>
</body>
</html>